My sites:

calculla.pl and calculla.com - online calculators (50+) from very simple (like adding few numbers, or converting meters to miles, etc.) to some advanced. All of them are working "instantly", so no reload of a page is involved, no "go" button, the result is just there while you're typing !

nodected.com - small embeded/IoT/Smart-Homes project I'm working on

zielona.ws - a community website of my home city (Zielona Góra in Poland)